Question: What are the physical constant which start with the letter w
Paraphrase: What are the physical consistent which begin with the letter w
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q173227 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'w')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Wien wavelength displacement law constant, Wien wavelength displacement law constant, weak mixing angle constant, weak mixing angle constant